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Employee Benefit Plans - Schedule of Defined Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 503,500 $ 568,679  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 570,219 499,843  
Service cost 79 104 48
Interest cost 23,732 25,830 25,931
Benefits paid (24,806) (19,927)  
Actuarial (gains)/losses (64,653) 66,388  
Curtailments/Settlements 0 (2,019)  
Projected benefit obligation at end of year 504,571 570,219 499,843
Plan Assets:      
Fair value at beginning of year 472,417 435,086  
Actual return on plan assets 8,911 58,147  
Company contributions 69 1,130  
Benefits paid (24,806) (19,927)  
Curtailments/Settlements 0 (2,019)  
Fair value at end of year 456,591 472,417 435,086
Funded status (47,980) (97,802)  
Amounts Recognized in Consolidated Balance Sheets:      
Current liabilities 0 0  
Noncurrent liabilities (47,980) (97,802)  
Total (47,980) (97,802)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Unrecognized net actuarial loss 119,091 175,347  
SERP
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 14,593 15,607  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 15,920 14,337  
Service cost 0 0  
Interest cost 749 721  
Benefits paid (804) (1,440)  
Actuarial (gains)/losses 662 2,302  
Curtailments/Settlements (1,655) 0  
Projected benefit obligation at end of year 14,872 15,920  
Plan Assets:      
Fair value at beginning of year 0 0  
Actual return on plan assets 0 0  
Company contributions 2,459 1,440  
Benefits paid (804) (1,440)  
Curtailments/Settlements (1,655) 0  
Fair value at end of year 0 0  
Funded status (14,872) (15,920)  
Amounts Recognized in Consolidated Balance Sheets:      
Current liabilities (832) (1,540)  
Noncurrent liabilities (14,040) (14,380)  
Total (14,872) (15,920)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Unrecognized net actuarial loss $ 9,343 $ 10,145